Fixes the following sparse warning:
drivers/staging/dwc2/core.c:2672:6: warning:
symbol 'dwc2_set_param_uframe_sched' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>